JP2870341B2 - Method for producing a plug having gas barrier properties - Google Patents
Method for producing a plug having gas barrier propertiesInfo
- Publication number
- JP2870341B2 JP2870341B2 JP5011420A JP1142093A JP2870341B2 JP 2870341 B2 JP2870341 B2 JP 2870341B2 JP 5011420 A JP5011420 A JP 5011420A JP 1142093 A JP1142093 A JP 1142093A JP 2870341 B2 JP2870341 B2 JP 2870341B2
- Authority
- JP
- Japan
- Prior art keywords
- mold
- gas barrier
- plug
- thin
- lower mold
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D5/00—Rigid or semi-rigid containers of polygonal cross-section, e.g. boxes, cartons or trays, formed by folding or erecting one or more blanks made of paper
- B65D5/42—Details of containers or of foldable or erectable container blanks
- B65D5/72—Contents-dispensing means
- B65D5/74—Spouts
- B65D5/746—Spouts formed separately from the container
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/46—Means for plasticising or homogenising the moulding material or forcing it into the mould
- B29C45/56—Means for plasticising or homogenising the moulding material or forcing it into the mould using mould parts movable during or after injection, e.g. injection-compression moulding
- B29C45/5675—Means for plasticising or homogenising the moulding material or forcing it into the mould using mould parts movable during or after injection, e.g. injection-compression moulding for making orifices in or through the moulded article
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/0081—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor of objects with parts connected by a thin section, e.g. hinge, tear line
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
- B29C45/14778—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles the article consisting of a material with particular properties, e.g. porous, brittle
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2995/00—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds
- B29K2995/0037—Other properties
- B29K2995/0065—Permeability to gases
- B29K2995/0067—Permeability to gases non-permeable
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2031/00—Other particular articles
- B29L2031/56—Stoppers or lids for bottles, jars, or the like, e.g. closures
- B29L2031/565—Stoppers or lids for bottles, jars, or the like, e.g. closures for containers
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Closures For Containers (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は、液体用紙容器に使用さ
れるガスバリヤ性フィルムをインサート成形したガスバ
リヤ性を有する口栓の製造方法に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a gas barrier plug having a gas barrier property, which is formed by insert molding a gas barrier film used for a liquid paper container.
【０００２】[0002]
【従来の技術】従来から、液体用紙容器の口栓には、円
筒状の周壁の内側に、支柱で連結された引張リングと、
切取部を切り取るための薄肉脆弱線とを有する閉塞板と
を形成した口栓が、一般に広く使用されており、使用時
には、引張リングを上方へ引っ張って、閉塞板の薄肉脆
弱線を引き裂いて、切取部を切り取って注出口を開口
し、内容物を注出していた。そして、液体用紙容器は、
最近の環境保全の風潮と相まって、従来より使用されて
いた酒類、乳製品、調味料、果汁飲料などの食品関係の
みならず、液体洗剤、シャンプー、染料、現像液などの
非食品関係にも使用されるようになって来た。使用範囲
が広がるにつれて、容器だけでなく、口栓にも、内容物
の保護特性からガスバリヤ性が求められるようになって
来た。口栓へガスバリヤ性を付与する方法としては、実
開昭６０−４３５４５号公報で開示されているように、
ガスバリヤ性フィルムをインサート成形した口栓が知ら
れている。2. Description of the Related Art Conventionally, a tap ring of a liquid paper container has a tension ring connected by a column inside a cylindrical peripheral wall,
A plug that forms a closing plate having a thin-walled weak line for cutting off the cutout portion is generally widely used.In use, the pull ring is pulled upward to tear the thin-walled weak line of the closing plate, The cutout was cut out, the spout was opened, and the contents were poured out. And the liquid paper container
In conjunction with the recent trend of environmental conservation, it is used not only for food related products such as alcoholic beverages, dairy products, seasonings, fruit juice beverages, etc., but also for non-food related products such as liquid detergents, shampoos, dyes, developing solutions It has come to be. As the range of use has expanded, not only containers, but also faucets have come to be required to have gas barrier properties in view of the protective properties of the contents. As a method of imparting gas barrier properties to a plug, as disclosed in Japanese Utility Model Laid-Open No. 43545/1985,
2. Description of the Related Art A plug having a gas barrier film formed by insert molding is known.
【０００３】[0003]
【発明が解決しようとする課題】しかしながら、従来の
ガスバリヤ性フィルムをインサート成形した口栓は、閉
塞板の薄肉脆弱線からの切取部の切れが悪かったり、開
口された注出口の周縁にフィルム残りがあったり、フィ
ルムの接着性が弱かったりなどの問題があった。本発明
は、口栓の製造方法に工夫を施して、ガスバリヤ性フィ
ルムをインサート成形することに起因して発生する上述
の問題を解決したのである。However, in the conventional plug having a gas barrier film formed by insert molding, the cut portion of the plug from the thin fragile line is poor, or the film remains on the periphery of the opened spout. And the film has poor adhesiveness. The present invention solves the above-mentioned problem caused by insert molding of a gas barrier film by devising a method for manufacturing a plug.
【０００４】[0004]
【課題を解決するための手段】本発明は、図３に示した
円筒状の周壁（３４０）の内側に、支柱（３５１）で連
結された引張リング（３５０）と、切取部（３３２）を
切り取るための薄肉脆弱線（３３１）とを有する閉塞板
（３３０）を形成し、且つ、その閉塞板の下面側にガス
バリヤ性フィルム（３２０）を接着した口栓（３００）
の製造方法において、図１（ａ）及び図１（ｂ）に示し
たように、薄肉脆弱線（３３１）を形成するためのＶ字
状の突起（１２１）を上縁周部に設けた内下型（１２
０）を、バキューム溝（１１１）を介して外下型（１１
０）の内側に、所定位置だけ下げた状態で組み合わせた
下型（１００）に、ガスバリヤ性フィルム（３２０）を
バキュームで装着し、この下型を上昇させてゲート（２
１０）を有する上型（２００）と型締を行い、所定の型
締ストローク（１１３）を残した段階で一旦型締めを停
止して、ゲートよりキャビティー（５００，上型と下型
との間の空間）内に溶融樹脂（４００）の射出を開始
し、ガスバリヤ性フィルムの薄肉脆弱線形成部が溶融樹
脂で覆われる程度に射出された時点で、再度、下型を前
記残りの型締ストロークだけ上昇させて上型と完全に型
締めし、上型と下型とより形成されたキャビティー内に
溶融樹脂をゲートから射出しながら、同時に、内下型を
定位置に上昇させて薄肉脆弱線を形成したことを特徴と
するガスバリヤ性を有する口栓（３００）の製造方法で
ある。According to the present invention, a tension ring (350) connected by a support (351) and a cutout (332) are provided inside a cylindrical peripheral wall (340) shown in FIG. A plug (300) formed with a closing plate (330) having a thin weak line (331) for cutting, and a gas barrier film (320) adhered to the lower surface side of the closing plate.
As shown in FIGS. 1A and 1B, a V-shaped projection (121) for forming a thin-walled weak line (331) is provided on the periphery of the upper edge. Lower mold (12
0) to the outer lower mold (11) through the vacuum groove (111).
A gas barrier film (320) is attached by vacuum to the lower mold (100) assembled in a state lowered by a predetermined position inside of (0), and the lower mold is raised to raise the gate (2).
The mold is clamped with the upper mold (200) having the above (10), and once the predetermined mold clamping stroke (113) is left, the mold is temporarily stopped and the cavity (500, between the upper mold and the lower mold) is moved from the gate. Injection of the molten resin (400) into the space between the lower mold and the remaining mold clamping is performed again at a point when the thin brittle line forming portion of the gas barrier film is injected to the extent that the molten resin is covered with the molten resin. Raise the stroke only to completely clamp the upper and lower molds, and inject molten resin from the gate into the cavity formed by the upper and lower molds, and at the same time raise the inner and lower molds to the fixed position and thin them. A method for producing a plug (300) having gas barrier properties, characterized by forming a fragile line.
【０００５】上述の本発明のガスバリヤ性を有する口栓
の製造方法は、本明細書では、縦型射出成形機で一個取
り金型を使用した場合の記載になっているが、横型射出
成形機を使用しても良く、また、量産時には、多数個取
り金型を使用して良い。[0005] The above-described method of manufacturing a plug having gas barrier properties according to the present invention is described in this specification in the case of using a single-piece die in a vertical injection molding machine. May be used, and in mass production, a multi-cavity mold may be used.
【０００６】また、口栓本体の材質は、ポリエチレンな
どのポリオレフィン系樹脂が用いられ、ガスバリヤ性フ
ィルムとしては、中間層に塩化ビニリデンフィルム、エ
チレン・ビニルアルコール共重合フィルム及びアルミニ
ウム箔などのガスバリヤ性フィルムを有した積層フィル
ムを使用し、その口栓本体（３１０）と接触するフィル
ム材質は、射出成形時に口栓本体の溶融樹脂と熱融着す
るものを使用する。The plug body is made of a polyolefin resin such as polyethylene. The gas barrier film is a gas barrier film such as a vinylidene chloride film, an ethylene / vinyl alcohol copolymer film or an aluminum foil. The film material that comes into contact with the plug body (310) is one that thermally fuses with the molten resin of the plug body during injection molding.
【０００７】[0007]
【作用】本発明の製造方法によると、所定の型締ストロ
ークを残した段階で、一旦型締めが停止して、キャビテ
ィー内に溶融樹脂が射出され、ガスバリヤ性フィルムの
薄肉脆弱線形成部が、射出された溶融樹脂で覆われて、
加熱された状態となり、引き続き、完全に型締めされ
て、キャビティー内にさらに溶融樹脂が射出されると同
時に、内下型が定位置に上昇され、加熱されて軟化した
ガスバリヤ性フィルムが、内下型の上縁周部に設けられ
たＶ字状の突起によって、引き延ばされながら薄肉脆弱
線を形成するため、使用時の引張リングの引張り力によ
って、引き割かれ易くなり、また、口栓本体に対するフ
ィルムの接着性が、従来のものより良好となる。According to the manufacturing method of the present invention, at a stage where a predetermined mold clamping stroke is left, the mold clamping is stopped once, the molten resin is injected into the cavity, and the thin weak line forming portion of the gas barrier film is formed. Covered with injected molten resin,
In the heated state, the mold is completely closed, and the molten resin is further injected into the cavity.At the same time, the inner and lower molds are raised to a fixed position, and the heated and softened gas barrier film is removed. The V-shaped projection provided on the upper edge periphery of the lower mold forms a thin weak line while being stretched, so that it is easily broken by the pulling force of the pull ring during use, and the The adhesiveness of the film to the stopper body is better than the conventional one.
【０００８】また、下型にガスバリヤ性フィルムを装着
する際に、内下型が外金型に対して所定位置だけ下げた
状態で組み合わされており、内下型の上縁周部に設けら
れた薄肉脆弱線を形成するためのＶ字状の突起が、金型
内に突出していないため、金型内に、ガスバリヤ性フィ
ルムを装着し易くなる。When the gas barrier film is mounted on the lower mold, the inner and lower molds are combined with the outer mold by lowering them by a predetermined position, and are provided on the upper edge peripheral portion of the inner and lower molds. Since the V-shaped projection for forming the thin thin brittle line does not protrude into the mold, it is easy to mount the gas barrier film in the mold.
【０００９】[0009]
【実施例】通常の縦型射出成形機に、本実施例のための
フィルムインサート成形用一個取り口栓金型の上型及び
下型を取り付た。この下型（１００）は、図１（ａ）に
示したように、薄肉脆弱線を形成するためのＶ字状の突
起（１２１）を上縁周部に設けた内下型（１２０）を、
突起の高さ分だけ定位置より下げた状態で外下型（１１
０）に組み合わせたもので、この下型内に、まず、（上
層）ポリエチレン／アルミニウム箔／ポリエチレンテレ
フタレート（下層）構成のガスバリヤ性フィルム（３２
０）を、バキューム孔（１１２）でバキュームポンプと
連結した内下型外周に設けられたバキューム溝（１１
１）で吸引して装着した。次に、この下型を上昇させて
ゲート（２１０）を有する上型と型締めを行い、１．０
ｍｍの型締ストロークを残した段階で一旦型締めを停止
して、ゲートよりキャビティー（５００）内に溶融した
ポリエチレン（４００）を射出し、ガスバリヤ性フィル
ムの薄肉脆弱線形成部を覆う程度に溶融したポリエチレ
ンが射出された時点で、再度、下型を前記の残りの型締
ストロークだけ上昇させて、上型と完全に型締めし、上
型と下型とより形成されたキャビティー内に溶融したポ
リエチレンをゲートから射出しながら、同時に、図１
（ｂ）に示したように、内下型（１２０）を定位置に上
昇させて、加熱されて軟化したガスバリヤ性フィルム
（３２０）を、内下型の上縁周部に設けられたＶ字状の
突起（１２１）によって、引き延ばしながら薄肉脆弱線
（３３１）を形成して、本実施例のガスバリヤ性を有す
る口栓（３００）を作製した。薄肉脆弱線の肉厚は、
０．２０±０．１５ｍｍであった。EXAMPLE An upper mold and a lower mold of a one-piece plug for film insert molding for this example were attached to a normal vertical injection molding machine. As shown in FIG. 1 (a), the lower mold (100) has an inner lower mold (120) provided with a V-shaped projection (121) on the periphery of the upper edge for forming a thin weak line. ,
Lower the outer lower mold (11
In this lower mold, first, a gas barrier film (32) composed of (upper layer) polyethylene / aluminum foil / polyethylene terephthalate (lower layer)
0) is connected to a vacuum groove (11) provided on the outer periphery of the inner and lower molds connected to the vacuum pump through a vacuum hole (112).
It was attached by suction in 1). Next, the lower mold is raised, and the upper mold having the gate (210) is clamped.
Once the mold clamping stroke of mm is left, the mold clamping is stopped once, the molten polyethylene (400) is injected from the gate into the cavity (500), and the gas barrier film covers the thin brittle line forming portion of the gas barrier film. At the time when the molten polyethylene is injected, the lower mold is raised again by the remaining mold clamping stroke, completely clamped with the upper mold, and into the cavity formed by the upper mold and the lower mold. While injecting molten polyethylene through the gate,
As shown in (b), the inner and lower mold (120) is raised to a fixed position, and the heated and softened gas barrier film (320) is placed in a V-shape provided on the upper edge periphery of the inner and lower mold. The thin-walled fragile line (331) was formed while being extended by the protruding protrusions (121), and the plug (300) having gas barrier properties of this example was manufactured. The thickness of the thin fragile wire is
0.20 ± 0.15 mm.
【００１０】作製した図２に示した口栓（３００）を、
最内層にポリエチレンフィルムを有する液体用紙容器の
スリーブ（ブランクをサック貼りしたもの）の注出口用
開口部に挿入し、口栓の台座リング（３６０）上面と紙
容器の内面とを超音波で熱融着して取り付け、口栓に口
栓の周壁（３４０）の雄ネジ（３４１）と螺合するキャ
ップを装着し、紙容器を製箱して底部を閉鎖し、天部の
開口部から水を充填した後、天部を閉鎖した。The manufactured plug (300) shown in FIG.
It is inserted into the spout opening of the sleeve of a liquid paper container having a polyethylene film as the innermost layer (a blank is attached with a sack), and the upper surface of the pedestal ring (360) of the plug and the inner surface of the paper container are heated with ultrasonic waves. The cap is fitted with a cap that is screwed into the male screw (341) of the peripheral wall (340) of the plug, the paper container is made into a box, the bottom is closed, and water is passed through the top opening. After filling, the top was closed.
【００１１】次に、作製した水を充填した液体用紙容器
を用いて、２００Ｋｍの輸送試験を行ったが、口栓の薄
肉脆弱線からの水漏れやガスバリヤフィルムの剥離など
は、全く発生しなかった。次に、開封試験のため引張リ
ングを上方に引っ張ると、周壁内部に形成された閉塞板
の薄肉脆弱線が引き裂かれ、切取部が切り離れて容易に
開口された。開口部の周縁には、フィルムの切れ残りな
どがなく、良好であった。Next, a 200 Km transport test was performed using the prepared liquid paper container filled with water, but no water leakage or peeling of the gas barrier film from the thin brittle line of the plug occurred. Was. Next, when the tension ring was pulled upward for the opening test, the thin weak line of the closing plate formed inside the peripheral wall was torn, and the cutout was cut off and opened easily. The periphery of the opening was good with no remaining film or the like.
【００１２】[0012]
【発明の効果】本発明のガスバリヤ性を有する口栓の製
造方法によると、ガスバリヤ性フィルムの型内への挿入
がし易く、作製された口栓の周壁内部に形成された閉塞
板の薄肉脆弱線の使用時の切れが良好で、しかも、切取
部が切り取られた開口部の周縁に、フィルムの切れ残り
がなく良好である。また、ガスバリヤ性フィルムの口栓
本体への接着が、従来の口栓よりも安定している。According to the method for producing a plug having gas barrier properties of the present invention, the gas barrier film can be easily inserted into the mold, and the closure plate formed inside the peripheral wall of the manufactured plug is thin and brittle. The cut is good when the wire is used, and the film is good because there is no uncut portion of the film around the opening where the cut portion is cut. Further, the adhesion of the gas barrier film to the plug body is more stable than the conventional plug.
【図１】図（ａ）は、本発明の製造方法における、所定
の型締ストロークを残した段階で一旦型締めを停止し
て、ゲートよりキャビティー内に溶融樹脂の射出を開始
し、ガスバリヤ性フィルムの薄肉脆弱線形成部が射出樹
脂で覆われた時点の状態を示す金型の部分断面図であ
り、図（ｂ）は、下型と上型とを完全に型締めし、キャ
ビティー内に溶融樹脂を射出しながら、内下型を定位置
に上昇させて薄肉脆弱線を形成した時点の状態を示す金
型の部分断面図である。FIG. 1 (a) is a view showing a gas barrier in a manufacturing method according to the present invention, in which mold clamping is temporarily stopped at a stage after a predetermined mold clamping stroke is left, and injection of molten resin from a gate into a cavity is started; FIG. 4B is a partial cross-sectional view of the mold showing a state at the time when the thin fragile line forming portion of the conductive film is covered with the injection resin, and FIG. FIG. 6 is a partial cross-sectional view of the mold, showing a state at the time when the inner lower mold is raised to a fixed position and a thin brittle line is formed while a molten resin is being injected into the mold.
【図２】本発明の製造方法によって作製された本実施例
のガスバリヤ性を有した口栓の断面図である。FIG. 2 is a cross-sectional view of a gas barrier plug having a gas barrier property according to the present embodiment manufactured by the manufacturing method of the present invention.
１００……下型 １１０……外下型 １１１……バキューム溝 １１２……バキューム孔 １１３……型締ストローク １２０……内下型 １２１……Ｖ字状突起 ２００……上型 ２１０……ゲート ３００……口栓 ３１０……口栓本体 ３２０……ガスバリヤ性フィルム ３３０……閉塞板 ３３１……薄肉脆弱線 ３３２……切取部 ３４０……周壁 ３４１……雄ネジ ３５０……引張リング ３５１……支柱 ３６０……台座リング ４００……溶融樹脂又は溶融したポリエチレン ４１０……ランナー ５００……キャビティー 100 lower die 110 outer lower die 111 vacuum groove 112 vacuum hole 113 mold clamping stroke 120 inner lower die 121 V-shaped projection 200 upper die 210 gate 300 ... Plug 310... Plug body 320... Gas barrier film 330... Obstruction plate 331... 360: base ring 400: molten resin or polyethylene 410: runner 500: cavity
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 平３−58813（ＪＰ，Ａ) 特開 昭61−23216（ＪＰ，Ａ) 特開 昭59−33109（ＪＰ，Ａ) 特開 平２−109818（ＪＰ，Ａ) 特開 平２−92605（ＪＰ，Ａ) 特開 平４−5031（ＪＰ，Ａ) 実開 昭63−192261（ＪＰ，Ｕ) (58)調査した分野(Int.Cl.6，ＤＢ名) B29C 45/00 - 45/24 B29D 22/00 B65D 47/36 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-3-58813 (JP, A) JP-A-61-23216 (JP, A) JP-A-59-33109 (JP, A) JP-A-2- 109818 (JP, A) JP-A-2-92605 (JP, A) JP-A-4-5031 (JP, A) JP-A-63-192261 (JP, U) (58) Fields investigated (Int. Cl. 6 , DB name) B29C 45/00-45/24 B29D 22/00 B65D 47/36
Claims (1)
引張リングと、切取部を切り取るための薄肉脆弱線とを
有する閉塞板を形成し、且つ、その閉塞板の下面側にガ
スバリヤ性フィルムを接着した口栓の製造方法におい
て、薄肉脆弱線を形成するためのＶ字状の突起を上縁周
部に設けた内下型を、バキューム溝を介して外下型の内
側に、所定位置だけ下げた状態で組み合わせた下型に、
ガスバリヤ性フィルムをバキュームで装着し、この下型
を上昇させてゲートを有する上型と型締を行い、所定の
型締ストロークを残した段階で一旦型締めを停止して、
ゲートよりキャビティー内に溶融樹脂の射出を開始し、
ガスバリヤ性フィルムの薄肉脆弱線形成部が溶融樹脂で
覆われる程度に射出された時点で、再度、下型を前記残
りの型締ストロークだけ上昇させて上型と完全に型締め
し、上型と下型とより形成されたキャビティー内に溶融
樹脂をゲートから射出しながら、同時に、内下型を定位
置に上昇させて薄肉脆弱線を形成したことを特徴とする
ガスバリヤ性を有する口栓の製造方法。1. A closing plate having a tension ring connected by a column and a thin weak line for cutting off a cutout portion is formed inside a cylindrical peripheral wall, and a gas barrier is provided on a lower surface side of the closing plate. In the method of manufacturing a plug with a functional film adhered, the inner and lower molds provided with a V-shaped projection on the upper edge periphery for forming a thin-walled fragile line, inside the outer lower mold via a vacuum groove, In the lower mold combined in a state lowered by a predetermined position,
Attach the gas barrier film with a vacuum, raise the lower mold, perform the mold clamping with the upper mold having the gate, and temporarily stop the mold clamping at the stage where a predetermined mold clamping stroke is left,
Inject the molten resin into the cavity from the gate,
At the point when the thin brittle line forming portion of the gas barrier film is injected to the extent that it is covered with the molten resin, again, the lower mold is raised by the remaining mold clamping stroke and completely clamped with the upper mold, and the upper mold is closed. A mouth plug having a gas barrier property, characterized in that the molten resin is injected from the gate into the cavity formed by the lower mold and at the same time, the inner lower mold is raised to a fixed position to form a thin fragile line. Production method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5011420A JP2870341B2 (en) | 1993-01-27 | 1993-01-27 | Method for producing a plug having gas barrier properties |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5011420A JP2870341B2 (en) | 1993-01-27 | 1993-01-27 | Method for producing a plug having gas barrier properties |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH06218762A JPH06218762A (en) | 1994-08-09 |
| JP2870341B2 true JP2870341B2 (en) | 1999-03-17 |
Family
ID=11777569
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5011420A Expired - Fee Related JP2870341B2 (en) | 1993-01-27 | 1993-01-27 | Method for producing a plug having gas barrier properties |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2870341B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2017050881A1 (en) * | 2015-09-25 | 2017-03-30 | Gr8 Engineering Limited | Injection moulding method |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7429170B2 (en) * | 2005-10-31 | 2008-09-30 | Owens-Illinois Closure Inc. | Method and machine for compression molding closure shells |
| ES2343131T3 (en) * | 2006-01-27 | 2010-07-23 | TETRA LAVAL HOLDINGS & FINANCE SA | UNIT AND METHOD FOR MOLDING OPENING DEVICES FOR APPLICATION TO CONTAINERS OF VERTIBLE FOOD PRODUCTS. |
| DE102006055236A1 (en) * | 2006-09-22 | 2008-04-03 | Fischbach Kg Kunststoff-Technik | Packaging container and method for its production |
| JP2008155954A (en) * | 2006-12-24 | 2008-07-10 | Nihon Tetra Pak Kk | Spout stopper, packaging container and method for manufacturing packaging container |
| CH712945A1 (en) * | 2016-09-22 | 2018-03-29 | Alpla Werke Alwin Lehner Gmbh & Co Kg | Method for producing a flat closure element with at least one thin point for closing a container opening. |
| IT201700113283A1 (en) * | 2017-10-09 | 2019-04-09 | Ermo | INJECTION MOLDING EQUIPMENT OF PLASTIC MATERIALS WITH A THIN WALL WITH THICKNESS LOCALLY REDUCED |
-
1993
- 1993-01-27 JP JP5011420A patent/JP2870341B2/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2017050881A1 (en) * | 2015-09-25 | 2017-03-30 | Gr8 Engineering Limited | Injection moulding method |
| US10875228B2 (en) | 2015-09-25 | 2020-12-29 | Gr8 Engineering Limited | Injection moulding method |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH06218762A (en) | 1994-08-09 |
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